Cording



- H. S. MARSHALL CORDING April 24, 1951 Filed Dec. 9, 1946 @MJ47MWMA7 I Patented Apr. 24, 1951 UNITED I Fries CORDING Herbert Stanley Marshall, Purley, England Application December 9, 1946, Serial No. 715,007 In Great Britain January 19, 1946 3 Claims. (01. 138-56) 'This invention relates to flexible cording or vide an article of the kind described which by ering, the plastic covering forming a sleeve closely supported by and adhering to the core andpenetrating into the helical spaces between adjacent turns of the coil forming the core, so that the inner surface of'the covering is helically recessed and extends and contracts with the coil.

The flexible plastic sleeving may, for example,

be formed from an elastomeric compound which comprises a vinyl chloride acetate resin compounded with a plasticiser to provide flexibility. Such material can be produced in a complete commercial colour range and lends itself well to the invention.

The accompanying drawings illustrate the invention.

Fig. 'l is a sectional elevation on a greatly enlarged scale of one form of core covered with a sleeve; and Fig. 2 is a detail thereof on a still larger scale.

The'sleeve a has a helical or serratedinner wall b which penetrates into the helical interstices or recesses between turns of the closely helically coiled metal-wire c, the convolutions of which are normally in substantially tangential contact.

Preferably the sleeve a is applied to the resilient core of helically coiled metal wire by feeding the latter. through a die (not shown) through which the core c passes with'a uniform clearance all round it, the plastic material being flowed under pressure into the space around the core 0 provided by said clearance.

As the core 0 is fed through the die the plastic forms the sleeve a closely surrounding and adhering to the core 0 and penetrating into the helical space 1) between adjacent turns of the coil, so that the inner surface of the covering a is helically formed and expands and contracts with the coil 0. The sleeve a having a core 0 thiscovering or sleeve a to extend or move with within maybe wound up on to a receiving drum I or otherwise'suitably packed or stored. Thus one covering is arranged in such manner as to allow the inner core 0 so that the inner core when extended remains fully covered, throughout its length, by the outer sleeve or covering. At the same time the outer covering or sleeve retains its substantially smooth and even surface. By this method of covering, a special end detachment for holding the surface cover and the inner core together is not necessary.

The device of the invention may, if desired, be

. used for attaching soft furnishings in rooms.

Also, it may be used as a clothes line, to facilitate hanging clothes, and one or more dependent cords may be attached to the line at its ends or intermediately so that the cord can be grasped by the hand and the line pulled down to a convenient height for the purpose indicated. On release of the said cord the line will return to its normal position.

What I claim and desire to secure by Letters Patent is: j

. 1. Flexible rod material comprising an extensible resilient core and a covering of elastomeric material thereover, said core being formed of spring wire wound into helical form with the adjacent convolutions normally in substantially side-by-side contact, said wire being of a cross-section to provide an exterior helical groove when so wound and the elastomeric covering being supported by and adherent to the core by engaging into the outer circumferential helical groove provided between the adjacent contacting convolutions of the core.

2. Flexible rod material according to claim 1 wherein the elastomeric material is the only covering for the core and is constrained to extend in unison with the extension of the core and to thereafter contract therewith.

3. Flexible rod material according to claim 1 wherein the elastomeric material is the only covering for the core and has a substantially cylindrical outer surface and an inner surface formed with helical ridges which are complemental to the outer circumferential helical groove provided between the adjacent convolutions of the core.

HERBERT STANLEY MARSHALL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 'Number Name Date 1,286,388 Mulconroy Dec. 3, 1918 1,674,934 Victoreen June 26, 1928 2,392,842 Smith Jan. 15, 1946 V FOREIGN PATENTS Number Country Date 443,813 Great Britain Mar. 6, 1936 

